Girls, hello! Is it normal for a child's stool to have mucus after a w…

Girls, hello! Is it normal for a child's stool to have mucus after a week of illness with cough and fever? He recovered last week, but now for 3-4 days I noticed mucus. Is this just phlegm coming out? I also got sick yesterday, maybe from that? The stool was green yesterday, but I ate cucumbers, thought it might be because of that. Should I go see a doctor? The baby is on GVB (they say that any stool can be normal as long as there is no blood and not white). This is my first child, and I am starting to worry ?